6817551420 has 96 divisors (see below), whose sum is σ = 19848628800. Its totient is φ = 1746325504.

The previous prime is 6817551407. The next prime is 6817551427. The reversal of 6817551420 is 241557186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6817551427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332836 + ... + 352724.

It is an arithmetic number, because the mean of its divisors is an integer number (206756550).

Almost surely, 2^6817551420 is an apocalyptic number.

6817551420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6817551420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9924314400).

6817551420 is an abundant number, since it is smaller than the sum of its proper divisors (13031077380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6817551420 is a wasteful number, since it uses less digits than its factorization.

6817551420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20127 (or 20125 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 6817551420 is about 82568.4650456819. The cubic root of 6817551420 is about 1896.1650644538.

The spelling of 6817551420 in words is "six billion, eight hundred seventeen million, five hundred fifty-one thousand, four hundred twenty".